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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2a4fbb53396e88d59e99c1eca18c9a57747d62e294aa8a26becd54456469bc' 
  AND token = 'BTglIkpeqCcavcf/1mHiVDBt51KXF3XF9ho6Wh4cyTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}